Note 7 - Fair Values of Financial Instruments (Details) - Fair Value Measurement of Warrant Liabilities and Derivative Liabilities (Warrant and Derivative Liabilities [Member])	6 Months Ended
Jun. 30, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Risk-free interest rate	0.60%
Expected dividends	0.00%
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected term	2 years 116 days
Volatility of stock price	114.50%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected term	2 years 131 days
Volatility of stock price	114.70%

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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